Disable all the browser_tests that are flaking more than 5% of the time on trybots.

chrome/browser/extensions/api/automation/automation_apitest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/extensions/api/automation_internal/automation_util.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "chrome/browser/extensions/extension_apitest.h"
@@ skipping 505 matching lines @@
 
     return RespondNow(NoArguments());
   }
 };
 
 // Factory method for use in OverrideFunction()
 ExtensionFunction* FakeAutomationInternalPerformActionFunctionFactory() {
   return new FakeAutomationInternalPerformActionFunction();
 }
 
-IN_PROC_BROWSER_TEST_F(AutomationApiTest, GeneratedTree) {
+// http://crbug.com/396353
+IN_PROC_BROWSER_TEST_F(AutomationApiTest, DISABLED_GeneratedTree) {
   ASSERT_TRUE(extensions::ExtensionFunctionDispatcher::OverrideFunction(
       "automationInternal.enableTab",
       FakeAutomationInternalEnableTabFunctionFactory));
   ASSERT_TRUE(extensions::ExtensionFunctionDispatcher::OverrideFunction(
       "automationInternal.performAction",
       FakeAutomationInternalPerformActionFunctionFactory));
   ASSERT_TRUE(RunExtensionSubtest("automation/tests/generated",
                                   "generated_trees.html")) << message_;
 }
 
 }  // namespace extensions